Cylinder-grinding machine



May 12, 1925. 1,537,217

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J. BALLOU ET AL CYLINDER GRINDING MACHINE 6 Sheets-Sheet 6 Filed March12. 1923 e 45 9W @aflow Witness e W- w QWOW M10 Patented May 12, 1925.

UNITED STATES PATENT or icE.

JAMES BALLOU AND GEORGE W. BALLOU, OF LITTLE ROCK, ARKANSAS.

\ CYLINDER-GRINDING MACHINE.

Application filed March 12, 192.3. Serial No. 624,622.

To all whom'z'zf may concern:

Be it known that we, JAMES BALLoU and inonon \V. BALLoU, citizensof theUnited States, residing at Little Rock, in the county of Pulaski andState of Arkansas, have invented certain new and useful Improvements inCylinder-Grinding Machines; and we do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appcrtains to make and use thesame.

Our invention relates to machines for grinding the cylinder of internalcombustion engines, the machine being of the type which may be securedupon the cylinder block of an automobile or similar motor when the headand pistons are removed, the machine being provided with a verticaldriven shaft carrying a grinding wheel and mounted for vertical movementand for travel on a circular path about the vertical axis of thecylinder being ground.

A base frame is provided to be supported by and rigidly secured upon thecylinder block, and a vertical guideway rises rigid- 1y from anadjustable slide on said base frame and is provided with] a verticallymovable carriage by which the grindingmeans are carried, and a furtherobject is to provide an operating motor for said grinding means, mountedon a novel support extending from the side of the carriage opposite thegrinding means, so that the weight of said grinding means and motor willbe counterbalanced at opposite sides of the carriage.

Another object of the invention, is to provide a novel driving means forthe grinding mechanism and its feed means.

Yet another object is to provide a belt driven by the motor for rotatingthe grinding shaft at a high speed, and a unique arrangement of partsfor holding said belt tight at all times, while permitting the necessaryyielding thereof, as the shaft travels along a circular path.

Another object is to adj ustably mount the above named verticalguideway, so that the grinding shaft may be located with extremeaccuracy, with regard to the cylinder being ground, said adjusting meansalso permitting movement of theentire guideway and parts carried therebyand turning thereof about a vertical axis, so that the differentcylinders may be successively ground without ad usting the base frame onthe cylin der block after it has once been secured in place thereon.

WVith the foregoing in view, the invention resides in the novel subjectmatter herein-' after described and claimed, the description belngsupplemented by the accompanying drawings. Figural is a side elevationof a grinding machine constructed in accordance with our invention.

Figure 2 is a side elevation partly in section looking at the oppositeside from Fig. 1.

F gure 3 is atop plan View.

Figure 4 is substantially a central vertical longitudinal sectionalview, parts however being in elevation.

F1gures 5, 6 and 7 are horizontal sectional views on the lines 5-5, 66and 77 of Fig. 4.

Figure 8 is a vertical transverse section on line 8-8 of Fig. 1.

In the drawings above briefly described, the numeral 1 designates ahorizontal base frame having parallel side bars 2, said frame beingadapted to rest flat upon and be suitably secured to the cylinder blockof an internal combustion engine, after the versely of the base frame 1and We have shown the horizontal base plate 7 of an upright guideway 8,clamped upon the carriage 5 by a vertical bolt 9. .lVhen loosened.slightly, this bolt permits pivotal adjustment of the guideway 8 orturning thereof a half revolution in addition to the longitudinal andtransverse adjustments afforded by the carriages 3 and 5, respectively.

The iideway 8 is preferably of arched form and the plate 7 is preferablyintegral with and rigidly connects the lower ends of the arch legs 10.In the present showing, these legs are formed with parallel undercutribs 11, with which a suitable vertical carriage 12 is slidably engaged.In the present showing, a vertical feed screw 13 passes rotatablythrough a bearing 14 secured to the crown 15 of the arched guideay 8 andis held against vertical movement in said bearing, said screw beingthreaded through a nut 16 which is swiveled in. an appropriate bracket17 suitably secured to the carriage-3. Means yet to be described, areprovided for driving the nut 16 in either direction and hence it will beseen that the carriage 12 may be vertically moved along the guideway 8as occasion may demand.

The upper end of screw 13 is preferably provided with a suitable handle18 for making manual adjustments of the carriage 12 and for holding saidscrew against rotation when movement of the nut 16 is relied upon tovertically feed said carriage, we have secured a toothed wheel 19 uponthe upper end of the screw and have provided a springpressed latch pin20 for engagement with said wheel. This pin is preferably mounted in ahorizontal bearing or guide 21 formed integrally with the bearing 14 andby withdrawing the pin from engagement with the toothed wheel 19 andturning it a fraction of a revolution, it will be held againstreengagement with said wheel until it is again turned to the properextent.

' nte ral With or otherwise joined to the vertical carriage 12 is avertically disposed accurately bored bearing 25 in which a vertical,cylindrical carrier 26 is rotatably 7 mounted, and the ends of saidhearing are preferably split vertically and provided with bolts or othercontracting means 27, whereby any slight wear may be taken up and thecarrier 26 prevented from having any loose motion. In the presentshowing,

the lower end of the carrier 26 is formed with an external shoulder 28abutting the lower end of the bearing 25, and the upper end of saidcarrier extends above said bearing, said upper end being provided with aworm gear 29 which is keyed thereon and is held in place by a suitablering 30 threaded upon the carrier. This Wormgear 29 is instrumental inrotating the carrier at a relatively slow speed as will be hereinafterdescribed.

A vertical grinding shaft 31, having a grinding wheel 32 on its lowerend is carried by the carrier 26 and is so mounted that it may be movedto different eccentric positions with respect to said carrier. In thepreferred form of construction, the shaft 31 rotates within a verticalsleeve 34 which at 35, is threaded into a vertically elongated eccentric36, said eccentric being rotatably received 'in a vertical bore 37 withwhich the carrier 26 is formed.

In the preferred form of construction,

the lower end of the eccentric 36 carries a Worm gear'37 received withinthe lower end of the carrier 26, said carrier being pro- I according tothe size of the cylinder being ground.

The eccentric 36 may be held against downward movement from the carrier26 in any preferred manner. We prefer however, to extend said eccentricabove the carrier and to thread an appropriate retaining ring 40thereon. A grooved pulley 41 011 the upper end of the shaft 31 holds thelatter against downward movement and a collar 42 which is interposedbetween the grinding wheel 32 and the lower end of the sleeve 34,prevents upward movement of said shaft, it being understood that bystating that we hold this shaft against downward and upward movement, werefer to movements with respect to the carrier 26 and not with respectto the base frame 1.

Attention is directed to the fact that the bearing 25 and all partssupported thereby are at one side of the vertical carriage 12. TheWeight of these parts however is more or less counterbalanced by theweight of an electric motor 43 which is horizontally mounted upon ahorizontal motor supporting plate 44 extending from the opposite side ofsaid carriage 12, the support 44 being preferably provided with anupstanding suitably braced flange 45 secured by cap screws or the like46 to said carriage. The shaft of the motor 43 is provided with agrooved pulley 47 which drives a round belt 48, the latter being engagedwith the pulley 41 for rotating the shaft 31. This belt is trained overa pair of guide pulleys 49 above the pulley 47, said pulleys 49 beingcarried by a slide 50 received within a suitable horizontal guide 51carried by the motor 43, said slide being forced outwardly by acompression sprin 52 within the guide 51. It thus follows t at the belt48 is held at the proper degree of tightness for properly driving theshaft 31, yetthis belt may yield to permit said shaft to travel on itscircular path.

A suitable end frame 53 rises from the outer end of the motor support 44and carries a bearing 54 which co-operates with a bearing bracket 55 onthe carriage 12, in rotatably supporting a horizontal shaft 56 having aworm 57 meshing with the worm gear 29 for rotating the latter and thecarrier 26. The shaft 56 is driven by a belt 58 and suitable pulleysfrom the shaft of the motor43.

case.

The end frame 53 is provided with another bearing 59 which co-operateswith a portion of the bracket 17 in upporting a second horizontal shaft60, tnis shaft being provided with a worm 61 meshing with a worm gear 62with which the nut 16 is provided. Means are employed for rotating thesliaft 60 in either direction to cause the nut 16 and the carriage 12 tomove upwardly or downwardly as occasion may require. 1n the presentshowing, the shaft 60 is provided with two loose pulleys 63 and 64,either of which may be connected with said shaft by a manually operableclutch member 65, one of said pulleys being driven in the-same directionas the shaft 56, by means of an ordinary belt 66 engaged therewith,while the other pulley is oppositely driven by a crossed belt 67, thetwo belts 66 and 67 being engaged with suitable pulleys 68 driven by theshaft 56.

By providing a machine of the character disclosed, cylindergrinding'operations may be easily performed without tearing down theentire motor. The base frame 1 may be clamped upon the cylinder blockafter removing the cylinder head and the pistons, without the necessityof hoisting the motor from the chassis frame and without disconnectingthe cylinder block from the crank Then, by properly adjusting theseveral parts, the grinding wheel 32 may be lowered into one of thecylinders and operated therein to truly grind the cylinder wall to thedesired diameter. lVhen one cylinder has been completely ground, themachine may be adjusted so that the wheel 32 may operate upon the nextcylinder. It will thus be seen that the entire set of cylinders may beground rapidly and easily.

It may here be further explained that when grinding the cylinders inone-half of an engine block, the grinding shaft 31 is positioned betweenthe guideway 8 and one end of the base frame 1, the carriage 3 beingadjusted along said base frame as required. In order to reach thecylinders toward the other end of the motor block, the entire grindingmechanism is raised until the wheel 32 will clear the frame 1. The bolt9 is then loosened and the guideway 8 and all parts carried thereby, areturned one-half revolution. Then, by adjusting the slide 3, these partsare moved over the end of the cylinder block in which the cylinders havealready been ground. Thus, the grinding shaft 31 may be lowered betweenthe guideway 8 and the opposite end of the frame 1, to grind theremaining cylinders. By having a machine which can be operated in thismanner, all of the cylinders may be ground withontonce moving oradjusting the base frame on the engine block after it is initially asecured in place.

Attention may be directed to the fact that during the grindingoperation, in order to prevent particles of metal and abrasive materialfrom falling into the crank case and later interfering with properlubrication, any suitable provision may be made.

As excellent results have been obtained from the details disclosed, theymay well be followed. However, within the scope of the invention asclaimed, numerous changes may be made.

We claim:

1. A cylinder grinding machine compris-' ing a vertical guideway havingtwo laterally spaced vertical tracks, a carriage slidably engaged withsaid tracks and spanning the space between them, cylinder grinding meanscarried by said carriage at one side of said tracks, a horizontal platesecured at one end to the side of the carriage remote from the grindingmeans, said plate passing between said vertical tracks and projectingfrom the side thereof remote from said grinding means, an electric motormounted on said plate, and driving connections between said motor andsaid grinding means.

2. A cylinder grinding machine comprising a vertical guideway having twolaterally spaced vertical tracks, a vertical carriage plate slidablyengaged with said tracks and spanning the space between them, said platehaving a vertical hearing at one side of the tracks and a rotatablegrinding shaft carrier in said bearing, a'horizontal plate between saidtracks and rigidly secured at one end to the lower end of said carriageplate, sai

alined bearings, driving connections between one shaft and the aforesaidgrinding shaft carrier, feeding means for the carriage plate driven bythe other shaft, an electric motor mounted on the above-named horizontalplate substantially under said shafts, driving connections between saidmotor and shafts, a grinding shaft carried by the afored horizontalplate projecting from the side of said carrier, and driving connectionsbetween said motor and said grinding shaft.

8. A cylinder grinding machine comprising a vertical guideway having twolaterally spaced vertical tracks, a vertical carriage plate slidablyengaged with said tracks and spanning the space between them, said platehaving a vertical hearing at one side of .the tracks and a rotatablegrinding shaft carrier in said bearing, a-horizontal plate between saidtracks and rigidl secured at one end to the lower end of sa carriageplate, said horizontal plate pro ect1ng from the side of said tracksremote from the carriageplate, a bracket between said tracks secured tothe upper end of said carnage plate and having a horizontal bearing, asecond bracket secured adjacent the upper end of the aforesaid verticalbearingand having a horizontal bearing, an end frame rising from theouter end of said horizontal plate and having two bearings alined withthe bearings of said brackets, a pair of parallel horizontal shaftsrotatablymounted in said alined bearings, driving connections betweenone shaft and the aforesaid grinding shaft carrier, feeding means forthe carriage plate driven by the other shaft, an electric motor mountedon the above-named horizontal plate substantially under said shafts,driving connections between said motor and shafts, a grinding shaftcarried by the aforesaid carrier and having a horizontal pulley at itsupper end, a vertical pulley on the motor shaft, a pair of co-axiavertical pulleys above said motor pulley and at right angles to the axisthereof, a horizontal slide carrying said co-axial pulleys and springpressed toward the aforesaid end frame, a guide for said slide disposedover and secured to said motor, and a driving belt trained around all ofthe aforesaid pulleys.

4. A machine of the class described comprising a support, a verticalshaft mounted thereon and having a pulley on its upper end, means forbodily moving said, shaft about a vertical axis, a horizontal motor onsaid support whose shaft is provided with a pulley, a horizontal guideover and secured to the motor casing, a slide engaged with said guideand spring-pressed away from said vertical shaft, said slide having apair of co-axial pulleys disposed on a horizontal axis above the motorshaft pulley, and a belt passing around the pulley of said verticalshaft and having horizontal reaches extending to said co-axial pulleys,

said belt having vertical reaches from said co-axial pulleys to themotor pulley.

5. A cylinder grindingi'nachine compris-.

ing a horizontally elongated base frame adapted to be secured on anengine block, a slide adjustable along said frame, a support on saidslide carrying vertically adjustable grinding means including a grindingshaft passing through the base frame between the support and one end ofthe frame, a vertical pivot connecting said support with said slide' andpermitting turnin of said support to position the grinding shaft towardthe other end of the frame, and means for normally holding said supportagainst turning on its pivot.

6. A machine of the class described comprising a base, a carriagelongitudinall adjustable thereon, a second carria e a justabletransversely of the first'name carriage, an arched guidewa havingparallel legs and a horizontal p ate rigidly connecting their lowerends, means pivotally clamping said horizontal plate to said secondcarriage on a vertical axis, a third carriage vertically movable alongsaid parallel legs of said guideway, a feed screw suspended from thecrown of said guideway and releasable means for holding it againstrotation, a nut swiveled on said third carriage and engaged with saidscrew, a horizontal motor support extending from said third carriagebetween the legs of said guideway and a horizontal motor mounted on saidsupport, reversible means for driving said nut from said motor, avertically elongated bearing carried by the side of said third carriageopposite said motor support, a vertically elongated cylindrical carrierrotatably mounted in said bearing and driven by said motor, and avertical grinding shaft carried eccentrically by said carrier and drivenby said motor. 1 I

In testimony whereof we have hereunto affixed our signatures.

JAMES BALLOU. GEORGE W. BALLOU.

